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Also known as web storage, simple storage, or by its alternate
session storage interface, this API provides synchronous key/value
pair storage, and is available in underlying WebView implementations.
Refer to the W3C spec for details.

Windows Phone 7 Quirk: Dot notation is not available, so be sure
to use setItem or getItem rather than access keys directly from
the storage object, as in window.localStorage.someKey.